Application of the hottest alicyclic epoxy resin i

2022-08-05
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Application of alicyclic epoxy resin in hybrid UV curing system

application of alicyclic epoxy resin in hybrid UV curing system

August 17, 2020

01

alicyclic epoxy resin can carry out cationic UV curing reaction. Its cured products have the advantages of small volume shrinkage, strong adhesion and good weather resistance. Especially in the application of free radical cationic hybrid UV curing system, it can cooperate with free radical cured products It can not only effectively improve the curing speed, but also be used with more oligomers and active diluents. It is widely used in UV curing coatings, inks, electronic adhesives, 3D printing and other materials

as a professional manufacturer of alicyclic epoxy resins, taitel can provide a variety of high-quality alicyclic epoxy resins, For example:

3,4-epoxycyclohexylformic acid-3,4-epoxycyclohexylmethyl ester (Brand: tta-21)

bis ((3,4-epoxycyclohexyl) methyl) adipate (Brand: tta-26) and so on

02

in order to provide customers with better technical support and better understand the application of alicyclic epoxy resin in free radical cation hybrid UV curing system, Tetel selected tta-21 as the cationic curing product to compare the properties of the cured product with epoxy acrylate and some active diluents. The cationic photoinitiator selected sulfonium salt (Brand: TTA uv-692) and iodonium salt (Brand: TTA uv-694), and the free radical photoinitiator selected 1-hydroxycyclohexyl phenyl ketone. At present, the mainstream direction is passive heat dissipation (184 photoinitiator)

the physical properties of the cured product are as follows:

03

the main performance advantages of the hybrid UV curing system containing alicyclic epoxy resin

1. High conversion of epoxy group

free radical photoinitiator sensitizes cationic photoinitiator and improves the light energy utilization of cationic photoinitiator

in addition, the free radical component provides more active hydrogen for the cationic component, and reduces the influence of moisture on the cationic component, thus accelerating the generation of proton acid, increasing the number of cationic active centers, and increasing the reaction rate and degree

2, the hybrid system with high tensile strength

has both free radical polymerization and cationic polymerization. The reaction speed of free radical polymerization is fast, and it can quickly form a rigid polymer skeleton structure under light. Subsequently, alicyclic epoxy resin continues to polymerize and crosslink on the basis of the skeleton structure through cationic polymerization to form a secondary structure. The two structures are intertwined with each other. Such a structure is not easy to be damaged when subjected to external forces and shows high tensile strength

3. Good volume shrinkage

when free radical polymerization occurs between prepolymer and monomer, the distance between them changes from the action distance of van der Waals force before curing to the distance between covalent bonds after curing. Therefore, the volume shrinkage is large, resulting in problems such as large internal stress and poor adhesion

in cationic ring opening polymerization of epoxy compounds, on the one hand, the van der Waals force acting distance between monomer molecules before curing changes to the acting distance between covalent bonds after curing, resulting in volume shrinkage; On the other hand, the size of structural units formed by ring opening polymerization of epoxy monomers is larger than that of monomer molecules, resulting in volume expansion. The combined action of the two makes the volume shrinkage of epoxy compounds smaller. Therefore, the volume shrinkage of free radical cationic hybrid UV curing system is smaller than that of single free radical UV curing system

The application of

alicyclic epoxy resin in hybrid UV curing system has raised more choices and possibilities for the research of UV curing technology and the development of special new materials

anodic aluminum oxide can color metal at the same time

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